Bidirectional modification of CA1 synapses in the adult hippocampus in vivo (original) (raw)

Nature volume 381, pages 163–166 (1996)Cite this article

Abstract

MEMORIES are believed to be stored by synaptic modifications. One type of activity-dependent synaptic modification, long-term potentiation (LTP), has received considerable attention as a possible memory mechanism, particularly in hippocampus1. However, use-dependent decreases in synaptic strength can store information as well. A form of homosynaptic long-term depression (LTD) has been described and widely studied in the CA1 region of the developing hippocampus _in vitro_2–4. However, the relevance of this model of LTD to memory has been questioned because of failures to replicate it in the adult brain _in vitro_5 and, more recently, _in vivo_6. Here we re-examine this important issue and find that homosynaptic LTD can in fact be elicited in the adult hippocampus in vivo, that it has all the properties described in immature CA1 in vitro, and that LTD and LTP are reversible modifications of the same Schaffer collateral synapses. Thus homosynaptic LTD is not peculiar to brain slices, nor is it only of developmental significance. Rather, our data suggest that the mechanisms of LTP and LTD may be equal partners in the mnemonic operations of hippocampal neural networks.

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Author notes

  1. Wickliffe C. Abraham: Department of Psychology and Neuroscience Research Centre, University of Otago, Dunedin, New Zealand

Authors and Affiliations

  1. Department of Neuroscience and Howard Hughes Medical Institute, Brown University, Providence, Rhode Island, 02912, USA
    Arnold J. Heynen, Wickliffe C. Abraham & Mark F. Bear

Authors

  1. Arnold J. Heynen
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  2. Wickliffe C. Abraham
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  3. Mark F. Bear
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Heynen, A., Abraham, W. & Bear, M. Bidirectional modification of CA1 synapses in the adult hippocampus in vivo.Nature 381, 163–166 (1996). https://doi.org/10.1038/381163a0

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